package com.cloudkinto.common.common;

/*******************************************************************
 *
 * IP地址工具类
 *
 * @author fanting
 * @version 1.0
 *
 *******************************************************************
 */
public class IPUtils {

    /**
     * 判断目标ip是否在指定ip地址段
     *
     * @param ipSection ip地址段
     * @param ip        目标ip
     * @return
     */
    public static boolean ipIsValid(String ipSection, String ip) {
        if (ipSection == null) {
            throw new NullPointerException("IP段不能为空！");
        }
        if (ip == null) {
            throw new NullPointerException("IP不能为空！");
        }
        ipSection = ipSection.trim();
        ip = ip.trim();

        // 直接判断是否相等
        if (ipSection.equalsIgnoreCase(ip)) {
            return true;
        }

        final String regxIp =
                "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
        final String regxIpb = regxIp + "\\-" + regxIp;
        if (!ipSection.matches(regxIpb) || !ip.matches(regxIp)) {
            return false;
        }
        int idx = ipSection.indexOf('-');
        String[] sips = ipSection.substring(0, idx).split("\\.");
        String[] sipe = ipSection.substring(idx + 1).split("\\.");
        String[] sipt = ip.split("\\.");
        long ips = 0L, ipe = 0L, ipt = 0L;
        for (int i = 0; i < 4; ++i) {
            ips = ips << 8 | Integer.parseInt(sips[i]);
            ipe = ipe << 8 | Integer.parseInt(sipe[i]);
            ipt = ipt << 8 | Integer.parseInt(sipt[i]);
        }
        if (ips > ipe) {
            long t = ips;
            ips = ipe;
            ipe = t;
        }
        return ips <= ipt && ipt <= ipe;
    }

//    public static void main(String[] args) {
//        String tobeCheckReg = "192.168.0.0-192.168.254.254";
//        String tobeCheck2 = "192.168.3.54";
//        if (ipIsValid(tobeCheckReg, tobeCheck2)) {
//            System.out.println("ip属于该网段");
//        } else {
//            System.out.println("ip不属于该网段");
//        }
//    }
}
